Selective signaling and control



3 E. E. KLEINSCHMIDT Re. 20,462

SELECTIVE SIGNALING AND CONTROL SYSTEM Original Filed April 16, 1928 3 s s 1 ANSWER BACK RECORDE B ii 248 E mama E M 249 f 25/ v 6,4 -'vwv- 236 2l7-/\ INVENTOR EDWA/eD E KLEl/YSCHMOT 1937- E. E. KLEINSCHMIDT Re. 20,462

' SELECTIVE SIGNALING AND CONTROL SYSTEM Origixial Filed April 16 1928 5 Sheets-Sheet 2 3nventor EDWARD E. KLEINSCHMIDT ttorneg Aug. 1937- E. EKLEINSCHMIDT Re. 20,462

SELECTIVE SIGNALING AND CONTROL SYSTEM Original Filed April 16, 1928 3 Sheets-Sheet 3 Reissuecl Aug. 3, 1937 Re.

UNITED STATES PATENT OFFICE SELECTIVE SIGNALING AND CONTROL SYSTEM Edward E. Kleinschmidt, Highland Park, 111., as-

signor to Teletype Corporation, Chicago, 111., a corporation of Delaware Original No. 1,895,718, dated January 31, 1933,

Serial No. 270,385, April 16, 1928. Application for reissue November 30, 1934, Serial. No. 755,440

29 Claims. (C1. 1'77353) My present invention relates to selective sigof the-former and the flexibility inherent in the naling and control systems, and more particularlatter. ly to the selective control and supervision for a Accordingly, it is an object of my invention to control station of devices such for example as p ovide me ns o Selectively Controlling and 5 circuit breakers, motors and the like-located at Supervising remotely dispo Power apparatus a point remote from the first station. unitsfrom a central dispatching point which is The development of large electric power sys- Simple, inexpensive and reliable. terns in recent years has been in the direction Another object of my invention is to provide of replacing the few large sized sub-stations in simple and inexpensive code responsive telea system by a large number of small'sized subrap qu p ent f Selectively Conditioning 10 stations scattered overan electrical system in motely disposed power equipment units for diaccordance with the power requirements at the rect control by a dispatcherand for providing the various localities. Such a network, however, of dispatcher with indications of the operations of small sub-stations connected with a main generthese'units. l5 ating station cannot be made commercially prac Still another object of the invention is to pro- 1;; ticable unless the sub-stations are unattended. vide a mechanical selectorin a supervisory con- An automatic equipment, operating, in response to trol system for identifying the remote selection changes in power conditions has, therefore, been made so that the dispatcher is assured of'the pardeveloped. As a result, most present day operatticular operation he willmake before an opering sub-stations particularly on electrified railation occurs. way systems are now entirely unattended, the cir- Other objects of my invention will appear in cuit breakers and other power units located the following detailed description of the pretherein being operated automatically in response ferredembodiment of my inventiomand are such to such changes as load voltage and current. as may be attained by utilization of the various While such automatic equipment has been principles, combinations and sub-combinations found to. be satisfactory for performing the nechereinafter set forth and defined by the terms of essary ope-rations while normal conditions exist the appended claims.

in the power system, it has been found imprac- In the drawingstical to develop automatic equipment which re Figure 1 is a diagrammatic view of the circuits 3O sponds to abnormal. conditions, such for example and apparatus at a dispatchers ofiice. as serious short circuits of a persistent nature, Figure 2is adiagrammatic view ofthe-circuits andexcessive power demands for short periods on and apparatus at a sub-station. one power circuit. Such abnormal conditions Figure 3 is a perspective view of a preferred are not, however, unusual and must be properly form of'selector receiving apparatus at a sub-stataken care of. t-ion. 35

In order to render the power system sufliciently Figure 4 is a view partly in section of the flexible to take care of all conditions there has notched bars employed in the receiver. developed in recent years manual remote con- Figure 5- is a. perspective view of the receiver trols, now known as supervisory control systems apparatus employed at the dispatching office 40 in which signaling circuit connections are made which operates-following a selection of a remote 40 between a dispatching. oflice located in the cenoperating circuit made by the dispatcher to identral generating station and each of the automatic tif'y the selection.

sub-stations, whereby the dispatcher can selec- Figure 6 is=a perspective view of the code break tively control each of the automatic circuit wheel attached to the circuit breaker which op- I breakers or other apparatus units. crates in response to 'an operation thereof for 45 The system is also provided with answer back transmitting a code to the dispatchers oifice in equipment which operates in response to the accordance with said operation. operation of any one of these units for giving the Figure '2 is a perspective view of the keyboard dispatcher an indication ofthe condition of the transmitter employed by the dispatcher for unit. In this manner, he is apprized at all transmitting the code to selectively operate the 50 times of the condition of all the units and can at remote unit". all times selectively operate any one of the units Figure 8 is a side view of a locking device for at any one of the stations. Thereis thus pro-. locking any operated selected lever in operated vided an automatic system with manual control position" and the non-operated selector levers in superimposed meeting the commercial necessities. non-operated position. 55

Cit

As shown in Figures 1 and 7, a plurality of key levers I, comprising a keyboard have upturned front ends 2 pivotally supported at 3 to a lever carrying member 4 which is properly secured to the frame of the transmitting apparatus. A spring 5 engaging each key lever I at an indent portion 6 thereof, and secured at its opposite end to the frame work at I normally maintains the lever I in its normal and non-operating position.

In co-operative relation with each of the key levers 2 are a plurality of longitudinally slidable bars 8, provided with bevelled lugs 9. As is well understood by those skilled in the art, when a key lever I is moved to its operated position against the action of compressing spring 5, the lower edge of the key lever engages the cams or bevelled portions of certain of the bars 8 and the further downward movement of the key lever I moves certain of these bars 8 longitudinally in either direction depending upon the slope of the bevelled portion engaged. In this manner, the keys when operated serve to set these bars in different combinations. At its right hand end, each permutation bar 8 is provided with a notch II in its upper edge which engages the rounded lower end of a corresponding selecting finger I 2. The selecting fingers I2 extend upwardly through an opening I3 in the base frame I4 and are mounted upon a common pivotal support I5 arranged between uprights I6. The fingers I2 control a set of switch shifters in the form of bell cranks II mounted upon a horizontal pivot shaft I8 carried by the upright I6. E'ach seiecting finger I2 has a hook lug I9 at its upper end, which as the associated'permutation bar is shifted, is moved into or out of engagement position above the ends of the horizontal arm of thevassociated switch shifters I1. The fingers I2 and bell cranks I1 are held in proper position by spacing washers (not shown) and preferably a guide comb (not shown) is also provided for the horizontal arms of the bell cranks or switch shifters I7. In addition to the switch shifters controlled by the permutation bars, an additional switch shifter 2I is provided not controlled by the selecting fingers. The contacts of this shifter are normally closed and are opened upon the first movement of the controller as will be described in more detail hereinafter.

E'ach bell crank or switch shifter I1 has a hook 22 at its upper end which engages the insulated upper end of a spring contact finger 23, each of which co-operates with stationary contact finger 24, mounted upon an insulated block carried by the upright I6. Each spring contact 23 tends to engage its associated contact 24 and also by producing a counter-clockwise rotational force on the associated switch shifter I'I serves to hold a lug 25 on the horizontal arm of the corresponding switch shifter in engagement with the surface of a cylindrical cam 26, the latter'being mounted on a horizontal shaft 21 extending above the horizontal arms of the switch shifters or controllers IT. The cam 26 is provided with a helical series of slots of which one slot 28 is shown and which as the cam 26 is rotated, successively pass over the lugs 25 of the switch controllers I'I. As the corresponding slot passes over one of the lugs, its associated switch contacts are closed provided the horizontal arm of the switch controller I7 is not held down by the corresponding selecting finger.

The shaft 21 is journalled in bearings (not shown) in the frame. Normally the cam 26, which is frictionally engaged by the shaft 2! is prein engagement with vented from rotating therewith by means of a stop mechanism (not shown) which is controlled by the key levers I to release'the disk inv a manner described in detail in patent to Krum. 1,595,472, issued August 10, 1926, in which is also found a clear description of the specific manner of mounting the shaft 21 and the cams herein illustrated diagrammatically. Inasmuch as the specific details of this construction do not constitute part of the present invention, they are merely described in general.

Fingers I 2 are provided at their upper ends with upwardly projecting lugs 32 having bevelled upper edges which cooperate with a bevelled rib 33 on a locking bail 34. The latter is pivotally mounted at 35 on the upright I6 and a spring 36 secured thereto and the upright I 5 tends to depress the lock bail and to hold a roller 31 thereon the dwell portion 38 of the transmitter cam 26. A lug 39 on the cam engages the roller 31 during the zero or normal ary the tension of spring 36.. Shortly after the cam starts, the spring 36 depresses the lock bail and holds the selecting fingers I2 bars 8 in set position and since inclined surface co-operating with each of the key levers, none of the key levers except the one and permutation depressed can be operated until the lock bail is ing portion 46 engages the insulated portion of when it engages the opposite contact 48, prepares .a circuit for switching the signaling line between the dispatchers office and sub-station from connection with the transmitter at the dispatchers office to connection with the receiver. This circuit is thus switched when the transmitter has completely operated. When any key lever I operates, log 44 on the associated latch slips over the upper edge of the key lever and locks the key in operated position. At the same time, contactor 47 engages contact 48 to prepare the circuit referred to above. A universal restoring bar 49 secured to armature 5| by screw 52 engages the horizontally projecting arm 53 of the lock lever operated to restore it to its normal position. ture 5| is operated by magnet 54, the circuit for which is completed over contacts 55 and 56 associated with the restoring key lever 51. When key lever 5'! is operated, magnet 54 is operated and rocks armature 5I which, in turn operates the universal bar 49 into engagement with the horizontal arm 53 of the operated lock lever to restore the same and its associated key lever to normal disengagement position.

As is well understood by those skilled in the art, the transmitter cam 26 is divided into seven sections of which one is shown in its operated position, when the cam 26 is in its arrested normal or zero position. The contact 2| of its associated switch controller 2|, is accordingly closed to normally hold the line closed. Operation of any key lever I will release the cam 26 for rotation. As the cam 26 rotates, the switch controllers II will be variably operated as the succeeding sections of the cam 26 pass through the operated position, in accordance with the setting of the permutation bars to close or hold open the other pairs of contacts 23 and duringthe five selecting intervals of the signal. At the endof the signal and before the cam is arrested, the switch controller will invariably restore the line to no current which will normally maintain a stop condition as the first section of the cam is again moved into operating position.

The apex 39 releases the lock bar 34 before the transmitter cam 26 is arrested so that if the keys I are rapidly operated the transmitter cam can be continuously rotated to transmit the signals to the line. But even under such conditions, the signals will be separated by intervals of normal line conditions which prevail as the first section of the cam member passes through the operated position so that ample opportunity is afforded the cams of the receiver to reach normal or zero position at the end of each signal before the starting condition of the succeeding signal isimpressed on the line.

As illustrated, if the transmitter contacts are connected directly to the line, the latter. is normally closed. The startinginterval is one of no current and the selecting signals are permutations of current and no current intervals.

When a key lever I is moved to its operated position it will engage the cam surfaces 9 of the permutation bars8 to move these bars longitudinally either to the right or left, depending upon the slope of the cam surface 9 of the bar when engaged by the key lever I. These will, in turn, rock certain of the selecting bars I2 about their pivots I5 counterclockwise to engage their associated switch controllers II' through lugs I9.

' This movement of a key lever I also releases the cam 26 which is then rotated with the shaft 21. Upon the first movement of the shaft 21', the apex 39 releases the locking bar 34 which thereupon engages the lug 32 to lock the selecting bars I2 in their operated or nonoperated positions.

These bars cannot, therefore,.be operated by any other key bar I during the signaling period. As the cam 26 then continues to rotate and the lugs 25 enter their cam depressions 28, successively,

the successive switch controllers I1 are either released for operation or held in non-operative position by the lugs I9 engaging the switch controllers I I, to in turn close the contacts 23 and 24. As the contacts 23 and 24' are successively closed, a circuit is completed from ground at BI through battery 62 through the contacts 24 and 23 over the conductor 63, back contact and armature 64, through the line polar relay 65 over conductor 66 connecting the dispatchers office and sub-stations through the polar relay 61, conductor 68, armature 65, and its back contact I over conductor II, a second sub-station through the polar relay I2 thereat, armature I3 and its back contact over conductor 14 to ground I5.

The normally biased polar relay 65 connected in the line circuit at the transmitting station comprises a pair of windings 15 and I1 and armature I8 normally held in a biased position in engagement with its left hand contact by the spring 19 as shown. The impulses'from battery 62, however, are of such polarity as to operate armature 18 out of engagement with its contact, but, as will be explained hereinafter, this operation of relay 65 has no efl'ect at this time.

At the sub-station, a similarly constructed polar relay 61 comprising a pair of windings 82 and 83 and a biased armature 84 held by spring 85 is provided. As will appear fro-m the description to follow, with energy in the line from battery 52, the armature, 8,4 is held disengaged from its contact. When, however, battery is removed from the line due to a start operation at the transmitter opening the line 66, spring 85 moves armature 84 to engage its contact. This operation of armature 84 completes an energizing circuit for receiver magnet 85' controlling a receiver at the sub-station to select an operating circuit for an apparatus unit.

The receiver magnet 85' operates an armature (not shown) to release and shift a cam shaft 855 axially during its rotation in a manner described in detail in patent to Kleinschmidt, 1,567,392 issued December 29, 1925. The cam shaft 86 is of the pin barrel type described in detail in the above referred to patent. A number of cams 8'5 to QI are axially spaced along the shaft 86 so that when the selector magnet 85 is energized, and the cams 81 to 9| are successively associated with their respective fingers 92 to 96, they will be in line with them, but when the selector magnet is deenergized the cams will pass between the fingers as the cam shaft rotates.

The first no-current or removal of energy from the line impulse on the line releases the shaft 86 for rotation by permit-ting the armature 84 to engage its contact and thereby establish the cir cuit over line 2I I to energize the magnet 85', but the succeeding impulses are effective only upon certain of the fingers 92 to 96 placing them in one or the other of their positions through the instrurnentality of their associated cams 81 to SI. The actuated ones of these fingers are locked in actuated position by the latches 91 individual to each of the fingers 82 to 96. When the fingers 92 to E6 have been completely set, selected ones of notched permutation bars I02 to I86 are permited to move to selected position under the influence of springs (not shown) in accordance with the setting of the fingers 92 to 9%. Immediately thereafter the selector fingers are in condition to be reset. The cam shaft 86, it will be understood, is driven through a friction clutch from a shaft (not shown) which is in turn driven by a continuously rotating motor (not shown) in the manner described'in detail in the above referred to patent.

As is well understood, the various combinations of selector bar positions bring into alignment different combinations of the notches thereof, and a selected actuating bar Hl'l positioned directly thereabove is permitted to drop, in the manner described in the above mentioned patent.

A series of these actuating bars In? extending through guide plates (not shown) are arranged to co-act with the selector bars I92 to I05 to effect the desired selection. Each bar H3! is provided with a cam projection I68 and a shoulder I99; Certain of these actuating bars are pivotally connected to the circuit selecting bars II2 which are operated thereby to effect the desired selection of a power apparatus unit. The actuating bars I01 are connected to the operating bars II2 by means of pins H4. It will be apparent that movement of the actuating bar I531 to the right will rock the operating bar II2 clockwise about its pivot II6 carried on the support H8 on the framework.

Cam surfaces I08 on the actuating bars III! are held by springs I20 against a universal bar I22 supported in member I24 which operates in a manner described in detail in the above referred to-patent. Secured to the member I24 is a universal operating bar I28.

As pointed out above, after the selector fingers 92 to 96 have been positioned according to the received combination, the permutation bars I02 to I06 are moved to their selected position simultaneously as recited in the above referred to patent and the bail universal member I24 is started into operation. As soon as the bars I82 to I06 are set to align a set of notches, the member I24 is permitted to move forwardly as the bail frame moves forward, all of the actuating bars I01 are permitted to drop as the bar I22 passes from under cam surfaces I88 held in engagement with the member I 22 by action of the springs I20. Since, however, only one set of slots may be aligned by each setting of the selector bars, all of the bars I01 except the selected one above the aligned notches are brought to rest by striking the selector bars, While the selected one drops far enough to permit engagement of the shoulder I09 with the operating bar I28.

The particular bar I81, over the aligned slots will continue to drop until it has entered therein when the continued movement of the operating bail frame I24 will cause the operating bar I28 to engage the shoulder I09 and will move this selected actuating bar I01 forwardly. The forward movement of the selector bar I01 will rock the circuit selecting bar II2 about its pivot II8. After the operating stroke of the selected actuating bar I01 has been completed, the operating bail I24 is moved in the reverse direction as described in the above referred to patent, and as it passes over the cam surface I08, it restores the selected bar I81 to normal.

The operating bar H2 is provided with a lug I29 which normally is engaged by the locking member I38 pivoted at I3I and urged into engagement with the lug I29 by the spring I32. Each of the operating bars H2 is provided with a horizontal arm #33 for controlling a contact member I34 individual thereto and properly insulated therefrom. Normally, the bar I I2 is in the position shown, and holds the contact member I34 in disengagement from the stationary contact I35. When, however, the bar H2 is rocked about its pivot in the manner described above, the contacts I34 and I35 are closed. Similar contact members I36 to I38 are here illustrated, it being understood that each of these contacts is controlled by a similar operating bar I I2, each contact in turn preparing an operating circuit for an individual pow-er apparatus.

When the operating bar I I2 is rocked about its pivot H6 in the manner described above, the locking bar I30 in co-operation therewith drops behind the lug I29 under the influence of the spring E32 and locks the selected bar H2 in operated position. This same movement of the locking member I30 through extension I4I rocks the bell crank I42 about its pivot I43 to shift the contactor 69 from engagement with its left hand contact I44 to engagement with. its right hand contact I45.

It will be recalled that in the circuit traced above from the dispatchers office to the substation, the circuit was completed through the contactor 89 and its contact I44. As a result of this switching operation, however, following the selection of bar II2 the signaling circuit from the transmitting station or dispatchers office is switched from a selecting to an operating position for operating the selected unit in the manher which is now to be described.

Each of the circuits controlled by the individual contacts, such as I34 and I35 has associated therewith an apparatus unit which is to be controlled. In the present illustration, a single circuit breaker is shown, although it will be understood of course, that this is merely illustrative, and that similar circuit breakers and other power apparatus units may be controlled over the other selecting circuits completed by the other contacts illustrated. The conductor I46 connected to the contact I34 is also connected to the tripping magnet I41 associated with the circuit breaker I48, the other terminal of the tripping magnet I41 being connected over conductor I49 and battery i5l to armature I52 of polar or operating magnet I53. The polar or operating magnet i53 comprises, in addition to the armature I52, windings I54 and I55, the armature I52 being normally biased by spring I56 in the position shown. The contact I51 with which armature I52 engages when the polar relay I53 is energized by currents of a predetermined polarity, is connected over conductor 58 to the stationary contact I35 co-operating with contact I34.

The power apparatus unit I48 here illustrated, comprises, in addition to the tripping coil I41 vhich through the pivoted lever arm I61 trips the circuit breaker, a closing coil I68 for moving the arm I69 to engage their power contacts. A toothed rack I1I connected to the circuit breaker arm meshes with a pinion I12 mounted on spindle I10 which carries rotatably therewith a cammed disk or break wheel I 13. A helical spring I 12' one end of which is secured to spindle I19, and the other to break wheel I 13 is tensioned by rotation of pinion I 12 to rotate wheel I 13, Fig. 6. A regulator I13 controlling pinion I14 meshes with gear I15 carried on shaft I18 and controls the speed of operation of disk I13. A contact controller I14 pivotally mounted at I15 is forced into engagement with the cammed disk I13 by the spring I16. As the pinion I12 rotates, as a result of either a tripping or restoring movement of the circuit breaker, the contact controller 514 moves the contact I11 into engagement with its associated contact I18 a. predetermined number of times and breaks the contact I19 from engagement with its associated contact I88. A code combination of impulse conditions is thereby transmitted to the dispatchers ofiice in accordance with the operation of the circuit breaker in a manner to be described in detail hereinafter. It will be understood that a different type of cammed disk I13 is provided for each circuit breaker so that on operation each sends a different code combination of impulse conditions. It will be noticed that the breaker wheel I13 is equipped With a plurality of cams irregularly disposed so that upon tripping the circuit breaker I48 one sequence of signal may be produced while upon closing the breaker, the wheel I13 travels in the reverse direction and another sequence of signals may be produced.

It will be noted that the circuit selecting member I I2 in addition to closing the contacts I34 and I35 is provided at its opposite extremity with a downwardly extendng portion I82 which engages a series of cammed permutation bars I83 to I81, as shown in detail in. Figure 3. The bars I83 to I81 comprise a code transmitting apparatus at the sub-station similar to the code transmitter operated by the keyboard bar I at the dispatching office described in detail above and need not, therefore, be again described. Each of the members II2, when selectively operated, will move the permutation bars I 83 to I81 longitudinally in difi'erent combinations to in turn cause closing of different combinations of the contactors I88 under control of the switch actuating member I9I as the cam shaft I92 rotates. It will be understood that there are a number of these contacts selectively closed as described in connection with the transmitter at the dispatchers oflice. Cams I93 are radially notched about cam shaft I92, tending sequentially to permit the movement of those bell cranks I93 which are not locked by the lugs I94 on selecting bars I95. The selecting bars I95 are held'in operated or nonoperated positions by lugs I95 engaging the locking bars I91 after the roller I98 has passed over the cam projection I99.

The construction and operation of the transmitter at the sub-station is identical with that at the dispatching ofiice, the cam shaft disk being tion together with the operation of any one of the bars I82 to transmit a code over contacts such as I88 in accordance with the bar operated and the switch bars selected in accordance therewith. During non-operation of the transmitter, the line 56 is closed, a circuit extending from ground at 202 through the coil 203, conductor 234, contacts I80 and I19 in engagement, over conductor 295 through the contacts 202 and 20I, conductor 205 through the relay I53 over the contact I45, and contactor 69 which, it will be recalled, is then in engagement with its right hand contact over conductor 68 through line office, armature 64 and its back contact, conductor 63, contacts 2| and battery 62 to ground at 6|. Upon operation of member H2, members I83 to I81 are operated in various. combinations to in turn operate their individual levers I95 and at the same time shaft I92 is released for rotation all as described in connection with the control station transmitter. Thereafter a code is transmitted over this circuit from the substation to the dispatchers station in accordance with the selected member I 12 to indicate to the dispatcher whether or not its selection was proper.

At this time, operation of relay 82 has no effect on the receiver magnet 85 at the sub-station inasmuch as its circuit is opened at contact 2 II by the rotation of cam 2I2. The transmitting cam shaft I92 is connected to disk 2I2 so that when it starts into rotation the disk 2I2 is also rotated and contact engaging arm 2I3 disengages the contact 2% I.

As a result of the operation of polar relay 65 at the clispatchers oince, armature 18 engages its contact to complete a circuit for the magnet 2 i over a circuit from battery 2E6, conductor 2I1, the armature 18 in engagement with its contact, conductor 2I8 through the contacts 2I9 and contactor 229, conductor 22I, and through the operating magnet 2I5 to the battery 2I6. The operating magnet simiiar in construction to that described in detail at the sub-station. A pin barrel selector 223 is normally held from rotation by a constantly driven motor shaft and is released by the first energization of magnet 2I5. As the selector 223 rotates, it is successively operated by magnet 2i5 to position selector fingers 224 in operated position. The selector fingers 224 will set permutation bars 221 to in turn condition one of the operating bars 228 for operation by operating member 229. The movement of operating member 229 in turn rocks selector member 23I about its pivot 232. An individual pivoted latching lever 233 mounted above a universal bar 234' is normally held in its non-latching position by member 23I. When, however, a member 23 i is moved to selected position, lever 233 is moved by its spring 235'tc normally held from. rotation is started into rota- I relay 82, conductor 66, relay 65 at the dispatchers 2I5 operates selector equipment.

drop in front of the member and at the same time carrying universal bar 234' in front of the other members tensioning spring 235'. The operated fingers 224 are latched by the individual pivoted members 225 which drop in front of the projecting lugs 225 under operation of springs 221. The operation of the selected bar 23I will also operate a contact 233 into engagement with the contact 234.

. Inasmuch as each of these contacts 233 is connected over an individual conductor such as 238, to its contact 41 controlled by its associated key lever i, it will be clear now that this circuit including the relay 293 will not be completed unless the received code indicative of the selection made at the sub-station is similar to the particular operated key bar at the dispatchers ofiice. If such is the case, a circuit will be completed from the battery 231 over conductor 238 through the relay 235, the contact 234 and contactor 233 in engagement over conductor 236' and through contactor 41 of the individual operated key lever I, to the opposite terminal of battery 231. Energization of the relay 235 will then switch the armature 64 from engagement with its back contact, over which, it will be recalled, the code for the sub-station selection was transmitted, to the substation to engagement with its front contact connected to the relay 241 the operating key 239 and battery 24!. The operation of the bar 23I thus apprises the dispatcher of the correct selection inasmuch as the code transmitted from the substation to which-the receiver at the dispatchers oflice responded was proof that the particular selector bar II2 selected at the sub-station as a result of the code transmitted thereto, by the operator from the dispatchers office was correct.

If the dispatcher now desires to operate the selected unit, it is only necessary to operate the key 239 to engagement with its contact, whereupon a circuit is closed from ground through the battery 24! over the key 239, coil 282, relay 241, the front contact and armature 64 to the polar line relay 65, conductor 56, polar line relay 82, armature 59 and its contact I45, to the operating polar relay I53, conductor 295 to normally closed contacts 25I and 202 of the transmitter, conductor 295, contacts I19 and H85, conductor 204, coil 203, and ground at 202. It will be noted that the polarity of this operating impulse is opposite from that of the code signals and accordingly the polar line relays 55 and 82 will merely tend to maintain their respective armatures in the bias position already maintained by their springs, and accordingly no operations will occur at these polar relays. The operating relay I53, however, is arranged to respond to this operating impulse to move its armature I52 from its biasing position maintained by spring I56 into engagement with its contact I51, and a circuit is thereupon completed for the particular selected unit. In the present case, the circuit for tripping solenoid I41 has been prepared and Will now be completed from the battery I5I over conductor I49 through the tripping solenoid I41, conductor I46, through the contacts I34 and I35 in engagement and over conductor I55 to the contact I51 and armature I52, and then to the opposite terminal of the battery i5I.

As a result of the energization of the tripping solenoid I41, the circuit breaker I48 will be tripped. As the circuit breaker moves, break wheel I13 is rotated to operate the contact lever I14 making contacts I11 and I18, and breaking contacts I19 and I80. It will be understood, that and moves it peculiar to each circuit breaker and that a different combination of code signals is transmitted from each breaker. These signals are transmitted from ground at 245, battery 246, over contacts I'll and I 78 in engagement over the conductor 265, through the normally closed contacts 2! and 202, conductor 206, to the polar relay I53, contact I45, and armature 69, conductor 68 through polar relay 82, conductor '66 polar relay 65, at the dispatching office to armature 64 and its right hand contact through the relay 241, coil 282, key 239, and battery 24I to ground.

It will be noted that in this circuit, batteries 245 and 24I are connected in series relation and accordingly a larger current will flow in this answer back signal than in the case of the control operation. The relay 241 is marginal and will not respond to the normal operating current transmitted by the battery 24I. When, however, the batteries MI and 246 are in series relation as in the above circuit, sufiicient current flows through the relay 241 to operate it. As a result of the operation of relay 241, armature 248 in turn completes a circuit for the recorder 249 through battery 25I. The recorder of any well known type is operated in accordance with the particular circuit breaker which has operated and the dispatcher is thus apprised of the particular unit which has operated and the manner of its operation.

It will be recalled from the above description that the selected operating bars H2 and 23I at the sub-station and ofilce when operated, are locked in selected position and remain so until released by the operation of a special release key 51 at the dispatcher's ofiice. In the present instance the restoring key 51 operates the notched bars 8 and simultaneously completes energizing circuit by the movement of the movable contacting member 56 into engagement with the contact 55 for the energizing magnets 54 and 255, the circuit being completed from battery 256 to the magnet 54 and magnet 255 in series over the conductor 251, the contact 56 in engagement with contactor 55 to the opposite terminal of the battery 256. As a result of the energization of the magnet 255, its armature 258 carrying a lug 259 on the end thereof, engages the lever 233 upward against the tension of its spring 235. Lock bar 234' is restored and releases operating member 23I which returns it to its normal position. Energization of magnet 54 operates its armature 5| to swing transversed bar 49 against projection 53 of the operated locking lever which is thus restored to release key lever l. Simultaneously, the contact 41 disengages contact 48 and as a result, the energizing circuit for the relay 236 is opened and the armature 64 drops to engagement with its left hand contact preparing a circuit for the selector codes from the transmitter. The bar 51, as noted above, also operates a predetermined combination of the notched selecting bars 8 which in the manner described above transmit a special restoring code combination of impulses to the substation. During the transmission of this code of impulses as in the case above, contacts 220 and 2I9 separate so that operation of the polar relay 65 is not effective to release the local magnet 2I5. Polar relay 82 at the sub-station, however, moves its armature 61 into engagement with its contact for receiving A predetermined combination of and I06 are operated in accompleting an energizing circuit magnet 85. selecting bars I02 20,462 the cam portions on the break Wheels I13 are cordance with this special restoring code to select an operating bar 260 associated with the lever arm 26I, normally urged to its non-operating position by the spring 2'62. When the bar 260 is operated, it rocks the bar 26 I about its pivot 263 and its lug 264 engages the projection 265 of the lever I36 which is thereupon rocked about its pivot I3I against the tension of spring I32 to release the operated bar II 2 from its locked position. Bar I I2 is thereupon restored to its normal position and opens the contacts I34 and I35. In this manner the apparatus is restored to normal following the operation of the selected unit and the answer back with this operation.

From the above, the operation of the apparatus should now be clear. When the operator at the dispatchers oifice desires to operate any desired selected power unit, he will operate a key bar such as I for transmitting a code in accordance with the particular unit which he desires to operate. The transmitting and receiving apparatus at each of the stations is normally in a non-operating position. When the key bar is operated, the transmitter at the dispatchers ofiice is started into operation and transmits a predetermined code of negative and no current polarity as indicated by the terminal markings of battery 62. Simultaneously, the particular operated key bar I and selecting bars 8 respectively are all looked in their operated position to prevent the operation of any other key or transmission of any other code at this time. The operation of the particular key bar I in addition to transmitting the code, also prepares an operating circuit for the relay 236 at contact 4'! which circuit is completed only when the correct code has been received from the sub-station indicating that the proper unit has been selected. As soon as the code transmitter at the dispatchers office starts operating, it immediately opens the circuit of the receiving magnet 2I5 at contacts 2I9 and 220 to prevent the operation of the local receiver by operation of the line polar magnet 65. The impulses, however, operate the line polar magnet 82 at the sub-station, which in turn controls the local receiver magnet 85. The first received impulse or start impulse which it will be understood, is not part of the code invariably operates relay 85' to release its pin barrel selector. Accordingly, the transmitter at the oflice and receiver sub-stations always start substantially, simultaneously insuring synchronous operation. The magnet 85 now operates according to the code to select the particular operating bar I I2, which will prepare a local selecting circuit to the particular unit which it is desired to be operated. A further result of the energization of this particular selecting bar II 2 is also to operate a transmitter at the sub-station similar in construction and to the operation of the transmitter at the ofiice. This selection, therefore, not only results in the preparation of an operating circuit at the sub-station, but will also start the code transmitter into operation which upon its first movement opens a local circuit to the magnet 85 at contact 2 and also transmits a code of impulses to the dispatchers ofiice. This code combination of impulses, it will be under stood, depends upon the particular bar H2 which has been selected.

When the code is received at the dispatchers office by the polar magnet 65, the circuit for the receiving magnet 2| 5 is completed inasmuch as the code transmitter at the disby closing this key.

operate impulses patchers office has completed is restored to normal and the contacts 2I9 and 220 are again in engagement. The receiver will be operated to select an operating bar such as 23I. Inasmuch as each of the selector bars 23I completes a circuit to an individual operating key bar I, which has, as described above, been previously prepared for the relay 236, the relay 236 will not be energized unless the correct operating bar 228 is operated; namely, the one controlling the circuit connected to the circuit prepared by operating key bar I. In this particular instance the bar 228 is individual to the practicular key lever -2 and if it is operated by the received code, this indicates that the correct selection was made at the remote station, in accordance with the code transmitted by the dispatcher. The dispatcher is now certain that in case he transmits an operating impulse, it will operate the proper breaker. Relay 236 is energized preparing the operating circuit for the dispatcher.

Having thus been apprized of the correctness of the selection at the sub-station, the dispatcher may now operate the particular unit desired to operate, by closing the key 239. It will be noted that the selecting code was transmitted over a circuit'completed over the back contact and armature 64. When the selection, however, has been properly made as evidenced by energization of the relay 236, the armature 64 is moved into engagement with its front contact preparing the circuit to key 239 for the operation desired and the dispatcher may now operate the selected unit It will be noted that the closing of the key 239 transmits an impulse of the opposite polarity from that transmitted by the selecting code and accordingly the relays 55 at the dispatchers office and 82 at the sub station will not be energized inasmuch as they are so biased that their impulses merely tend to maintain the armature in the bias position already maintained by their respective springs.

At the sub-station, operation of the bar II2 by the selecting code, not only prepares the individual circuit to the particular power unit desired to be operated, but also switches the signaling circuit from. armature 69 and its contact I44 to engagement with contact I45, thereby connecting the polar operating relay I53 in the line circuit. This relay, it will be noted, is biased oppositely from the other polar relays in the line circuit so that the impulse of the opposite polarity such as issue when the operator depresses the key 239 whilenot operating the polar relays 65 and 82, will operate the polar relay I53 to move its armature I52 into engagement with its contact completing the prepared selecting circuit to the power unit desired, in this case, the tripping coil I41.

The tripping of the circuit breaker automatically operates a code transmitter by rotating the cam disk I13 for transmitting a code combination of impulses over the signaling line. Battery 246 at the sub-station and MI being in series, currents of increased value are transmitted. Although this current will operate the polar relay I53, it will obviously have no further effect inasmuch as it merely continues energizing the trip coil I41. At the dispatchers office, however, the impulses will operate the relay 241 which is marginal and accordingly was not operated by the from battery 24I alone. Ener- 'gization of relay-241 in turnoperates the answer its operation and back recorder 249 which'is of a well known type employed in the telegraph art.

It will be clear that not only the apparatus units located at the first sub-station may be thus operated, but also apparatus units located at the sub-station at which the polar relay 12 is located. Since the number of operations which may be made, depends merely upon the number of impulses in each code, any practical number of selections can be made. Certain of these selections can'be completed at the first'sub-station and others at the second sub-station associated with the polar relay 12. The armature I3 is moved into engagement with its front contacts in the same manner as. the armature I44 moves into .engagement with its right hand contact I45 for completing a circuit to the operating polar relay 250 at the second sub-station. Similarly, the signaling line can be extended through other substations for selections thereat as desired. It will be evident from this that a single continuous circuit can be employed for making selections at a plurality of sub-stations.

It will be noted that condensers such as 211, 218, 219 and 2BI are connected across the armature contacts for the purpose of preventing arcing during the operation of the contacts, inasmuch as the present system is particularly adapted for transmission of current of telegraph magnitude thereby making the system considerably more rugged thanhas heretofore been possible. Resistance coils 203 and 282 are connected in the circuit for preventing a short circuiting of the batteries.

Although a separate selecting circuit is employed in this system for closing and tripping a breaker, it will be clear that the same selecting circuit using currents of difierent characteristics such as two frequencies for tripping and closing may be employed. It is also possible with this system to select a circuit for controlling any combination of breakers simultaneously by connecting a plurality of magnets I41 in a line I46.

It will be clear from the above description, that an arrangement is shown whereby applying telegraph equipment with its accompanying ruggedness and operation, selections made by code combinations of impulses first identify for the dispatcher the selection made before the selected unit is operated and provide answer back signals operated in accordance with the particular unit operated and its particular operation to apprise the dispatcher of the conditions of the operated units.

Although this invention is disclosed as applied to a specific arrangement, it will be understood that the invention has broader application and may be applied in numerous other manners.

Having shown and described the preferred embodiment of my invention, it will be apparent that many equivalents will present themselves to those skilled in the art. The present invention is not limited to the use of the specific embodiment in the specific arrangement shown. Therefore, what is desired to be secured by Letters Patent and is claimed as new is:

1. In a supervisory control system, a control station, a remote station, a plurality of devices .at said remote station to be controlled from the control station over said line, a rotary start stop code transmitter and a rotary start stop code receiver at each of said stations normally in perative relation with said signaling line, means for operating said code transmitter at said con- .trol station .for transmitting-a code combination of impulses to said remote station over said line, means controlled by the transmitter at said control station for preventing the operation of said receiver thereat during the transmission of said code, means whereby said code receiver at said remote station is responsive to said code for conditioning one of said devices thereat for operation and means including the code transmitter at the remote station for transmitting a verifying code to said control stationover said line in accordance with said device selected, means at said control station responsive to said code for operating the receiver thereat to verify said selection, means at said remote station for preventing the operation of said receiver thereat during the transmission of said verifying code and means at said control station for operating said selected device at said remote station.

2. In a signaling system, a control station, a remote station, a plurality of apparatus units at said remote station, a signaling line connecting said stations, relay means connected in said signaling line, permutation mechanism at said re mote station, electromagnetic means controlled by said relay means for variably operating said permutation mechanism in accordance with received code combinations of impulses, a code transmitter at said remote station, said code transmitter and said permutation mechanism being normally in a non-operating condition, means responsive to the first impulses received by said relay means for starting said permutation mechanism into operation, a plurality of devices, means controlled by said permutation mechanism for variably operating one of said devices, means controlled by one of said devices for conditioning an apparatus unit at the remote station for operation, and for starting and variably opcrating said code transmitter thereat, means controlled by said code transmitter for transmitting code combinations of impulses over said signaling line through said line relay and means whereby said permutation mechanism thereat is non-responsive to said code combinations of impulses.

3. In a. signaling system, a control system, a remote station, a plurality of apparatus units at said remote station, a signaling line connect ing said stations, relay means connected in said signaling line, permutation mechanismat said remote station, electro magnetic means controlled by said relay means for variably operating said permutation mechanism in accordance with received code combinations of impulses, a code transmitter at said remote station, said code transmitter and said permutation mechanism. being normally in a non-operating condition, means responsive to the first impulses received by said relay means for anism into: operation, a plurality of devices, means controlled by said permutation mechanism for variably operating one of said devices, means controlled by one of said devices for conditioning an apparatus unit at the remote station for operation and for starting into operation and variably operating said code transmitter, means controlled by said code transmitter for transmitting code combinations of impulses over said signaling line through said relay means, means whereby said permutation mechanism at said remote station is non-responsive to said code combinations of impulses and permutation means at said control. station responsive to said impulses for variably operating a signaling device in accordance with the received code.

4. In a signaling system, a control station,

starting said permutation mecha remote station, a plurality of apparatus units at said remote station, a signaling device at said control station, a signaling line connecting said stations, relay means connected in said signaling line, permutation mechanism at said remote station, electro-magnetic meians controlled by said relay means for variably operating said permutation mechanism; in accordance with received code combinations of impulses, a code transmitter at said remote station, said code transmitter and said permutation mechanism being normally in non-operating condition, means responsive to the first impulses received by said relay means for starting said permutation mechanism into operation, a plurality of devices, means controlled by said permutation mechanism for variably operating one of said devices, means controlled by one of said devices for conditioning an apparatus unit at the remote station for operation and for starting and variably operating said code transmitter, means controlled by said code transmitter for transmitting code combinations; of impulses in accordance with the selection made over said signaling line through said relay means, means whereby said permutation mechanism at said remote station is non-responsive to said code combinations of impulses, permutation means at said control station responsive to said impulses for variably operating said signaling device thereat in accordance with the received code, relay means connected in said signaling line at said control station, electroi-magnetic means responsive to said last mentioned relay means for variably operating said permutation mechanism at said control station in accordance with received code indicating the selections made at the remote station, a code transmitter for transmitting code combinations of impulses for variably operating the permutation mechanism at said remote station and means whereby said code receiver at said control station is rendered nonresponsive to the code transmitted by said code transmitter thereat.

5. In a signaling system, a control station, an operating key at said control station, a remote station, apparatus units and an operating means at said remote station, a device at said control station for each of said units, a signaling line connecting said stations, a rotatable code transmitter and receiver at each of said stations, said transmitter and receiver being normally in a non-operating condition, means responsive to the operation of one of said devices for starting said code transmitter thereat into rotation, means controlled by said code transmitter for trans.- mitting code col lbinations of impulses over said signaling line, means whereby said code receiver at said control station is rendered non-responsive to said code combination, means responsive to the impulses of said code combination for releasing said code receiver at said remote station, means whereby said code receiver in response to said code combination of impulses received over said signaling line conditions one of said apparatus units for operation and simultaneously starts said transmitter thereat into operation for transmitting a code combination of conditions in accordance with the selection. made; means responsive to the operation of said code transmitter thereat for releasing said code receiver at said control station into rotation, means whereby said code receiver at said remote station is rendered nonresponsive to said transmitted code, means at said receiving station responsive to the variable operation of said code receiver thereat for making a selection means whereby if said code received agrees with the code transmitted said operating key is rendered operative and means controlled by said operating key for operating said operating means at said remote station for operating said conditioned apparatus unit.

6. In a signaling system, a control station, an operating key at said control station, a. remote'station, apparatus units and an operating means at said remote station, a device at said control station for each of said units, signaling means at said control station forindieating the condition of said units, a signaling line connecting said stations, a rotatable code transmitter and receiver at each of said stations, said transmitter and receiver being normally in a non-operating condition, means responsive to the operation of one of said devices for starting said code transmitter thereat into rotation, means controlled by said code transmitter for transmitting code combinations of impulses over said signaling line, means whereby said code receiver at said control station is rendered non-responsive to said code combination, means responsive to the impulses of said combinations for releasing said code receiver at said remote station, means whereby said code receiver in response to said code combination of impulses received over said signaling line conditions one of said apparatus units for operation and simultaneously starts said transmitter thereat into operation for transmitting code combinations of conditions in accordance with the selection made, means responsive to the operation of said code transmitter thereat for releasing said code receiver at said control station into rotation, means whereby said code receiver at said remote station is rendered non-responsive to said transmitted code, means at said receiving station responsive tothe variable operation of said code receiver thereat for making a selection, means whereby if said code received agrees with the code transmitted said operating key is rendered operative, means controlled by said operating key for operating said operating means at said remote station for operating said conditioned apparatus unit and means whereby responsive to the operation of said unit said signaling means is operated at said control station in accordance with the unit operation.

'7. In combination, a control station, a remote station, a plurality of devices at said remote station to be selectively controlled from said control station, transmitting and receiving means at each of said stations ope-rating means at said control station, a signaling line connecting said stations, said signaling line being normally connected to said transmitting means at said control station and to said receiving means at the remote stations, means including said transmitting means at said transmitting station for variably operating said receiving means at. said remote station, means responsive to the operation of said receiving means at said remote station for selecting one of said devices for operation, operating means at said remote station normally disconnected from said signaling line, said receiving means being simultaneously operated in response to said control station transmitting means to connect said operating means to said signaling line, operating means at said control station, said transmitting means at said remote station, operating in response to said selection of a unit for directly operating said receiving means at said control station over said signaling line, said control station receiving means being responsive to control from said remote station transmitting means for switching said signaling line from said transmitting means at said control station to said operating means thereat, means including said operating means and said signaling line for operating said operat- 1 ing means at said remote station and means responsive to the operating means at said remote station for operating said selected device.

8. In a supervisory control signal; a control station; a remote station; a signaling line connecting said stations; a line switch therefor; electromagnetic means for operating said switch; a plurality of apparatus units at said remote station; a key bank comprising a plurality of key levers at said control station; a normal non-operating code transmitter at said control station normally connected to said line; means controlled by the operation of any one of said key levers for starting said code transmitter into operation to transmit code combinations of signaling conditions over said line to said remote station in accordance with the operated key lever; means responsive to the operation of said key lever for locking said key lever in operated position and the remaining key levers in non-operated position and for preparing a circuit for said line switching electro-magnetic means; means at said remote station responsive to said received code combination for selecting a unit for operation; means at said remote station responsive to the selection of one of said units for transmitting a code combination of signaling conditions to said control station in accordance with the selection made thereat; a code receiver at said control station responsive to said received code combinations of signaling conditions for completing the circuit of said line switching means; operating means; means controlled by said switching means for disconnecting said control station transmitter from said signaling line and switching said line to said operating means; means including said operating means operative over said switched line for operating said selected apparatus unit.

9. In a supervisory control system; a control station; a. remote station; a signaling line connecting said stations; a line switch therefor; electro-magnetic means for operating said switch; a plurality of apparatus units at said remote station; a key bank comprising a plurality of key levers at said control station; a normal non-operating code transmitter at said control station normally connected to said line; means controlled by the operation of any one of said key levers for starting said code transmitter into operation to transmit code combinations of signaling conditions over said line to said remote station in accordance with the operated key lever; means responsive to the operation of said key lever for locking said key lever in operated position and remaining key levers in non-operated position and for preparing a circuit for said line switching electroemagnetic means; means at said remote station responsive to said received code combination for selecting a unit for operation; means at said remote station responsive to the selection of one of said units for transmitting a code combination of signaling conditions to said control station in accordance with the selection made thereat; a code receiver at said control station responsive to said received code combinations of signaling conditions for completing the circuit of said line switching means; operating means; means controlled by said switching meansfor disconnecting said control station transmitter from the signaling line and switching said line to said operating means; means including said operating means operative over said switched line for operating said selected apparatus unit, and means responsive to the operation of said unit for indicating said operation at said control station.

10. In a supervisory control system; a control station; a remote station; a single signaling line connecting said stations; normal non-operating start stop transmitting and receiving apparatus at each of said station's; a plurality of apparatus units at said remote station; operating key levers individual to each apparatus unit at said control station; means controlled by the operation of any one of said key levers for startingsaid code transmitter thereat into operation to transmit a start condition and a code combination of signaling conditions over said line in accordance with the key lever operated; means responsive to a start condition for starting said code receiver at said remote station into operation; means for operating a single electro-magnet at saidremote station responsive to said received code combinations of impulse conditions for variably operating said receiver in accordance with the received code combination; means controlled by said code receiver for selecting one of said apparatus units for operation; means controlled by said selection for starting said code transmitter at said remote station into operation to transmit a code combination of signaling conditions over said signaling line to said control station in accordance with the selection made; and a single electro-magnet at said control station responsive to code combinations of impulse conditions for variably operating said control receiver at said control station in accordance with the received code for indicating the selection made at the remote stationi 11. In a supervisory control system; a control station; a remote station; a single signaling line connecting said stations; normal non-operating start stop transmitting and receiving apparatus at each of said stations, said transmitting apparatus being normally connected to said line; a plurality of apparatus units at said remote station; operating key levers individual to each apparatus unit at said control station; operating means at said control station; means controlled by the operation of any one of said key levers for starting said transmitting apparatus thereat into operation to transmit a start condition and a code combination of signaling conditions over said line in accordance with the key lever operated; means responsive to a start condition for starting said transmitting apparatus at said re,- mote station into operation; a single electromagnet at said remote station responsive to said received code combinations of impulse conditions for variably operating said receiver in accordance with the received code combinations; 'means controlled by said receiving app-aratus for selecting one of said apparatus units for operation; means controlled by said selection for starting said transmitting apparatus at said remote station into operation to transmit a code combination of signaling conditions over said signaling lineto said control station in accordance with the selection made; a single electro-magnet at said control station responsive to code combinations of impulse conditions for variably operating said receiving apparatus at said control station in accordance with the received code combination for indicating the selection made at the remote station; a switching means for switching said signaling line from said transmitting apparatus at said control station to said operating means; a plurality of electric circuits for said switching means one for each of said key levers; means whereby each of said circuits is prepared in response to the operation of its associated key lever; and means whereby said prepared circuit is completed in response to the operation of the associated receiving apparatus whereby said switching circuit is completed only if said received code combination indicates that the remote selection was made in accordance with the operated key.

12. In a supervisory control system; a control station; a remote station; a single signaling line connecting said stations; normal non-operating start stop transmitters and receivers at each of said stations, said transmitters being normally connected to said line; a plurality of apparatus units at said remote station; operating key. levers individual to each apparatus unit at said control station; operating means at said control station; means controlled by the operation of any one of said key levers for starting said code transmitter thereat into operation to transmit a start condition and a code combination of signaling conditions over said line in accordance with the key lever operated means responsive to a start condition for starting said receiver at said remote station into operation; a single electro-magnet at said remote station responsive to said received code combinations of impulse conditions for variably operating said receiver in accordance with the received code combinations means controlled by said receiver for selecting one of said apparatus units for operation; means controlled by said selection for starting said transmitter at said remote station into operation to transmit a code combination of signaling conditions over said signaling line to said control station in accordance with the selection made; a single electro-magnet at said control station responsive to code combinations of signaling conditions for variably operating said control receiver at said control station in accordance with the received code combination for indicating the selection made at the remote station; switching means for switching said signalingline from said code transmitter to said operating means; a plurality of electric circuits for said switching means one for each of said key levers; means whereby each of said circuits is prepared in response to the operation of its associated key lever; means whereby said prepared circuit is completed in response to the operation of the associated receiving means whereby said switching circuit is completed onl if said received code combination indicates that the remote selection made was made in accordance with the operated key; and means controlled over said switched circuit for operating said selected unit.

13. In a supervisory control system; a control station; a remote station; a single signaling line connecting said stations; normal non-operating start stop transmitters and receivers at each of said stations, said transmitters being normally connected to said line; a plurality of apparatus units at said remote station; operating key levers individual to each apparatus unit at said control station; operating means at said control station; means controlled by the operation of any one of said key levers for starting said code transmitter thereat into operation to transmit a start condition and a code combination of signaling conditions over said line in accordance with the key lever operated; means responsive to a start condition for starting said receiver at said remote station into operation; a single electromagnet at said remote station responsive to said received code combinations of signaling conditions for variably operating said receiver in accordance with the received code combination; means controlled by said receiver for selecting one of said apparatus units for operation; means controlled by said selection for starting said transmitter at said remote station into operation to transmit a code combination of signaling conditions over said signaling line to said control station in accordance with the selection made; a single electro-magnet at said control station responsive to code combinations of impulse conditions for variably operating said control receiver at said control station in accordance with the received code combination for indicating the selection made at the remote station; switching means for switchingsaid signaling line from said code transmitter to said operating means; a plurality of electric circuits for said switching means one for each of said key levers; means whereby each of said circuits is prepared in response to the operation of its associated key lever; means whereby said prepared circuit is completed in response to the operation of the associated receiver whereby said switching circuit is completed only if the receiver code combination indicates that the remote selection made was made in accordance with the operated key; means controlled over said switched circuit for operating said selected unit; and means controlled over said switched circuit in response to the operation of said unit for indicating said operation at said controlled station.

14. In a supervisory control system; a control station; a remote station; a start stop code transmitter and code receiver at each of said stations; an electro-magnet for controlling said start stop receiver at each of said stations; a single circuit connecting said transmitters and receivers including means whereby said start stop receivers cannot be started into operation while the transmitter at their respective stations is in operation; a plurality of apparatus units at said remote station; operating keys individual to each of said apparatus units at said control station; means controlled by the operation of any one of said keys for starting said code transmitter at said control station into operation to transmit a code combination. of signaling conditions over said circuit in accordance with the key operated; means at said remote station responsive to said received code combination for operating said receiving magnet thereat whereby said receiver thereat is variably operated in accordance with the received code and said transmitter thereat is correspondingly operated to return a verification signal to the receiver at said control station; and means controlled by the received code combination at said remote station over said line for selecting one of said units for operation.

15. In a supervisory control system; a control station; a remote station; a start stop code transmitter and code receiver at each of said stations; an electro-magnet for controlling said start stop receiver at each of said stations; a single circuit therefor controlled by the code transmitter thereat whereby said start stop receivers cannot be started into operation while said transmitter thereat is in operation; a plurality of apparatus units at said remote, station;

operating keys individual to each of said apparatus units at said control station; means con-' trolled by the operation of any one of said keys for starting said code transmitter at said control station into operation to transmit a code combination of signaling conditions over said line in accordance with the key operated; means at saidremote station responsive to said received code combination for operating said receiving magnet thereat whereby said receiver thereat is variably operated in accordance with the received code; means controlled by the received code combination for selecting one of said units for operation; means responsive to the selection of said unit for starting said code transmitter at said remote station into operation; means controlled by said remote transmitter for transmitting a code combination of signaling conditions over said line in accordance with the selected unit; means at said control station responsive to said received code combinations of impulse conditions for variably operating said receiver magnet thereat; and means controlled by said receiver in accordance with the operation of said magnet for indicating said selection.

16. In a supervisory control system; a control station; a remote station; a signaling line connecting said stations; a start stop code transmitter and code receiver at each of said stations normally connected for transmission over said line; an operating means at said control station; an electro-magnet for controlling said start stop receiver at each of said stations; a circuit therefor controlled by the code transmitter thereat whereby said start stop receivers cannot be start ed into operation while said transmitter thereat is in operation; a plurality of apparatus units at said remote'station; operating keys individual to each of said apparatus units at said control station; means controlled by the operation of any one of said keys for starting said code transmitter at said control station into operation totransmit a code combination of signaling conditions in accordance with the key operated ;,means at said remote station responsive to said received code combination for operating said receiving magnet to actuate said receiver in accordance with the received code; means controlled by the received code combination for selecting one of said units for operation; means responsive to the selection of said unit for starting said code transmitter at said remote station into operation; means controlled by said remote transmitter for transmitting a code combination of signaling conditions in accordance with the selected unit; means at said control station responsive to said received code combinations of signaling conditions for variably operating said receiver magnet thereat; means controlled by said receiver in accordance with the operation of said magnet for indicating said selection; and means operative only in the event that said selection agrees with said operated key lever for switching said line to said operating means. 7

17. In a supervisory control system; a control station; a remote station; a signaling line connecting said stations; a start stop code transmitter and code receiver at each of said stations normally connected for transmission over said line; an; operating means at said control H station; an electro-magnet for controlling said start stop receiver at each of said stations; a

circuit therefor controlled by the code transmitter thereat whereby said start stop receivers cannot be started into operation while said transmitter thereat is in operation; a plurality of apparatus units at said'remote station; operating keys individual to each of said apparatus units at said control station; means controlled by the operation of any one of said keys for starting said code transmitter at said control station into operation to transmit a code combination of signaling conditions in accordance with the key operated; means at said remote station responsive to said received code combination for operating said receiving magnet thereat whereby said rereiver thereat is variably operated in accordance with the received code; means controlled by the received code combination for selecting one of said units for operation; means responsive to the selection of said unit for starting said code transmitter at said remote station. into operation; means controlled by said remote transmitter for transmitting a code combination of impulse conditions in accordance with the selected unit; means at said control station responsive to said received code combinations of impulse conditions for variably operating said receiver magnet thereat; means controlled by said receiver in accordance with the operation of said magnet for indicating said selection; means operative only in the event that said selection agrees with.

said operated key lever for switching said line to said operating means; and means controlled over said switched line for operating said selected unit.

18. In a supervisory control system; a control system; a remote station; a signaling line connecting said stations; a start stop code transmitter and code receiver at each of said stations normally connected for transmission over said line; an operating means at said control station; an electro-magnet for controlling said start stop receiver at each of said stations; a circuit for said magnets at each station controlled by the code transmitter thereat whereby said start stop receivers cannot be started into operation while said transmitter thereat is in operation; a plurality of apparatus units at said remote station; operating keys individual to each of said apparatus units at said control station; means controlled by the operation of any one of said keys for starting said code transmitter at the control station into operation to transmit a code combination of signaling conditions in accordance with the key operated; means at said remote station responsive to received code combinations for operating said receiving magnet thereat whereby the receiver thereat is variably operated in accordance with the received code; means controlled by the received code combination for selecting one of said units for operation; means responsive to the selection of said unit for starting said code transmitter at said remote station into operation; means controlled by said remote transmitter for transmitting a code combination of impulse conditions in accordance with the selected unit; means at said control station responsive to said received code combinations of impulse conditions for variably operating said receiver magnet thereat; means controlled by said receiver in accordance with the operation of said magnet for indicating said selection; means operative only in the event that said selection agrees with said operated key lever for switching said line to said operating means; means controlled over said switched line for operating said selected unit; and means controlled in. accordance with the operationv of said selected unit and operative over said switching line for indicating said operation at said control station.

19. In a signaling system, a signaling line, a transmitter including elements having coded notch and lug conditions, signal transmitting contacts controlled in their operation by said elements, and means permutably selectable in accordance with control conditions communicated over said signaling line for setting said elements accordingly and for thereby operating said transmitting contacts to initiate an electrical signal.

20. In a retransmitting mechanism, the combination of selectively settable bars, a receiving distributor for allocating incoming impulses to control the selective operation of said bars, a plurality of subjective apparatus to be remotely controlled, a group of relays and circuits for initiating said remote control, a set of code bars permutably positionable for retransmitting a proving signal, and means controlled by each of said settable bars for simultaneously conditioning a relay circuit in said group and for individually positioning said code bars in accordance with an individual proving signal.

21. The combination set forth in claim 20 including means for retransmitting over a single channel control line impulses corresponding with the positioning of said code bars.

22. In a supervisory control system, a remote station including a set of shiftable bars having edgewise thereof notch and lug attributes distributed in accordance with a permutable code so as toafford an individual transverse alignment for each shift arrangement thereof, a distributor composed of a set of elements corresponding to cyclic intervals during which signal impulses received over a line are routed to the control operation of each bar of said set, a plurality of selectable members each conditioned by an individual arrangement of said bars, a plurality of local circuits each supervised by one of said selectable members for the operation of an associated ap paratus, a set of code transmitting bars corresponding in number to said set of shiftable bars for retransmitting a proving signal to indicate the propriety of a selection, and means associated with each of said selectable members for instantly positioning said retransmitting bars.

23. A selection repeater system comprising a receiver mechanism, a set of permutation elements controlled thereby, a set of transmitter cams, means operated by said cams and controlled mechanically by said permutation elements indicative of the operation of said elements, contact means controlled by said cam operated means for the transmission of signal conditions, and a plurality of circuit conditioning contacts controlled by said permutation elements for establishing other electrical conditions.

24. In a signaling system, a line connecting a plurality of stations, a transmitter and a receiver connected to said line at one of said stations, said transmitter including a plurality of notched permutation bars, and cam means for operating said bars in varying combinations, means in said receiver responsive to code combinations of impulses tr-ansmitted over said line from another station, a selector bar in said receiver operated in response to the operation of said means by a particular code combination of impulses, and means responsive to the actuation of a selector bar for operating said cam means to set said notched permutation bars of the transmitter and effect the transmission of a group of impulses identified with said selector bar.

25. In a signaling system, a receiving mechanism, a plurality of selector bars, means in said receiving mechanism for selecting said bars, a transmitter having a series of notched combination bars movable in varying combinations to correspond with each signal received by said receiving mechanism, a rotatable shaft, cam means clutched to said shaft for one revolution in response to the actuation of a particular selector bar in the receiving mechanism, and means controlled by said combination bars through a selector bar and operated correspondingly by said cam means for transmitting a signal identified with the particular selector bar selected.

26. In a supervisory control system, a line connecting a plurality of stations, a keyboard transmitting mechanism at one of said stationsincluding means for transmitting verifying signals over said line, a permutation code receiving mechanism associated with said keyboard mechanism and connected to said line, means in said receiving mechanism responsive to signals received over said line, means operated in accordance with the means in said receiver for operating the transmitting means of said transmitter, means operative during the actuation of said transmitting mechanism for disabling said receiving mechanism, comprising a cam in said transmitting means, and a circuit breaker controlled by said cam for opening the signaling line to said receiving mechanism.

27. In a signaling system, a single line of communication, a transmitter and a selector connected to said line, said selector including permutation code selecting elements responsive to permutably arranged signal impulses impressed on said line and a selector bar operated in accordance with the actuation of said code selecting elements, permutation bars in said transmitter, and means operated by said selector bars for setting the permutation bars of the transmitter to effect the transmission of code signals over said line identified with the selector bar selected and operated.

28. A permutation code retransmitting system comprising a pair of serially connected relays, a receiving selector mechanism comprising a set of permutation bars and a code bar setting electromagnet under the control of one of said relays, a receiving selector mechanism remote to said other selector mechanism comprising a set of permutation code bars and a distributor magnet for setting said bars, a plurality of elements conditioned by each of said selector mechanisms and individually selectable, a transmitting shaft associated with said first selector mechanism having a series of transmitting cams, a source of current supply, permutation code means, and means under the control of the individually selectable elements of said first selector mechanism for operating said permutation code means and causing the operation of said transmitting shaft to transmit code signalsfrom said source to excite said other of said relays tooperate said other selector mechanism.

29. In an intercommunication system, a first station having a transmitting mechanism and a receiving mechanism, a second station having a transmitting mechanism and a receiving mechanism, a single communication line connecting said stations, means at each of said stations under the control of its own transmitting mechanism for disabling its receiving mechanism, locking means for disabling the transmitting mechanism of said first station upon its transmission of a selecting signal over said line, and means under the control of the transmitting mechanism at said second station over said line for releasing said locking means at the first station.

EDWARD E. KLEINSCHMIDT. 

